Help Me Figure Out the Dream?

Not knowing your current camper layout, would it be possible to reconfigure what you have to do away with the dinette and add a couch since you said you don't need a dinette? Sounds like you are pretty handy, so you could probably do the work yourself in pretty short order. Also, while a triple slide willl give you more room, it seems like a triple slide would have difficulty fitting completely in a standard parking space.

As far as the boats are concerned, the Cat seems to be your favorite. Could you sell the monohull and pay someone to finish the Cat or at least do all of the epoxy work?